Question

find tha sum of 2n terms of 3n2+2n+1​

Answer 1

Answer:

hey mate refer the attachment.

goodnite.

Answer 2

Answer:

$</p><p>⇒S1=2(1)+3(1)2=5Sn=2n{2a+(n−1)d}Sn=2n{a+a+(n−1)d}Sn=2n{a+an}2n+3n2=2n{5+an}4+6n=5+an⇒an=6n−1⇒ar=6r−1$